Are you looking for a planetary gears?
Applications that require particularly high precision present design engineers with a choice: Which gearbox is the right one? Above all, compact precision gearboxes with a long service life are in demand. In many cases, planetary gearboxes are considered the optimal solution. However, this is not always the best option. Do you value maximum precision, absolute reliability and minimum space requirements? Then our cycloidal gearboxes and strain wave gears are just right for you!
The areas of application of the gearbox types overlap, but our precision gearboxes can replace planetary gearboxes in many applications - be it in plant engineering, robotics, machine tool construction or medical technology.
Precise, durable,
high reduction and compact
If precision and positioning accuracy are essential, cycloidal gears and strain wave gears consistently offer better performance data than planetary gears. They have a longer service life, achieve top values in terms of precision, realize very high reduction ratios with only one to three gear stages and offer 500 % higher overload safety.
Cycloidal gears have reduced backlash or are virtually backlash-free (hysteresis loss < 1 arcmin, pure backlash 0.1-0.2 arcmin), while strain wave gears score with absolute zero backlash. By way of comparison: conventional planetary gearboxes normally have a backlash of 1 to 3 arcmin and often have to contend with increasing backlash over the course of their service life. With cycloidal gears, on the other hand, the increase in backlash is extremely low, even over a long period of time.
Strain wave gears allow reduction ratios from 30:1 to over 160:1, cycloidal gearboxes from 30:1 to over 300:1 - without the need for additional preliminary stages that are otherwise required for standard planetary gearboxes. Due to their design, cycloidal gears are also significantly stiffer, more compact (approx. 50 % shorter) and lighter than multi-stage planetary gears.
Discover cycloidal gears Discover strain wave gearsThe advantages of our gearboxes:
- Longer service life
- Maximum precision
- Strain wave gears: Absolute freedom from backlash
- Cycloidal gears: Virtually no increase in backlash over the entire service life
- Greater rigidity
- More compact design
- Lower weight
- Higher overload safety
- Maintenance-free over the entire service life
- No additional preliminary stages
Planetary gears
If there are no such high backlash requirements or if reduction ratios of i < 30 are required, planetary gearboxes, also known as planetary gearboxes, have an advantage. They essentially consist of three basic elements: a central sun gear, three or more satellite or planetary gears and a ring gear. In a typical planetary gearbox, the sun gear transmits the movement to the satellites. These then roll in the static ring gear. The planetary gears are mounted on the planet carrier, which then transmits the speed to the output shaft.
In contrast to simple reduction solutions, such as worm gears, planetary gears exert less force on the gears, as the torque is always distributed over several gears. This distribution also ensures low-noise operation without interrupting the power flow.
Precision planetary gearbox
Precision planetary gearboxes are planetary gearboxes with reduced backlash and belong to the group of ultra precision drives. At 1 arcmin, however, this is still higher than with cycloidal gears, which have a pure backlash of only 0.1-0.2 arcmin. There is also a clear difference in the hysteresis loss (= pure backlash + friction loss): in precision planetary gearboxes, the hysteresis loss is more than one arcmin, whereas in cycloidal gearboxes it is significantly lower.
Cycloidal gears also offer two further advantages: For the same nominal torque, they deliver both a higher acceleration torque (peak torque) and a higher emergency stop torque. The higher acceleration torque is particularly relevant in highly dynamic applications, for example in precision rotary table systems and in SCARA and delta robots. The higher emergency stop torque offers additional safety and is important for applications in which the protection of people has top priority, for example in medical technology and wherever people work on or with machines.
